can I change the UV editor when colour blind?
There is no way that I know of to change what blender generates from these options without editing the code and creating a custom build.

This would however make a good feature request and it would be worth trying to get in contact with some of the devs and seeing if they can help.

That said their is a fairly simple workaround. If you want a greyscale version, you can just save the image out of blender and use your preferred image editing software to convert it to greyscale. Then whenever you want to check your UVs, just load this converted image from disc rather than using blender's generated options.